The Monnit Wireless Resistance Sensor outputs the resistance across a load. It is programmed to sleep for a user-given time interval (heartbeat) and then wakeup, send power to the load resistor, wait for it to stabilize, and convert the analog data, mathematically compute the resistance and transmit the data to the gateway, where it is then logged into a cloud service. The user can configure defined thresholds and have the system alert on threshold breaches. Data is recorded in Ohms.
The standard version of this sensor is powered by two replaceable 1.5 V AA sized batteries (included with purchase). This sensor is also available with a line power option. The line powered version of this sensor has a barrel power connector allowing it to be powered by a standard 3.0 - 3.6 V power supply (Included with Line Power option upgrade). The line powered version also uses two standard 1.5 V AA batteries as backup for uninterrupted operation in the event of line power outage.
Power options must be selected at time of purchase, as the internal hardware of the sensor must be changed to support the selected power requirements.
* Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.
Resistance Sensor Specifications
|Resistive Range (in Ohms)||0 – 145000|
|Specific Resistive Ranges (in Ohms)||0 – 530, 530 – 3500, 3500 – 27200, 27200 - 145000|
|Resolution||2047 Unique Values Per Specific Range (11 bit): ~.25, ~1.71, ~13.3, ~70.8.|
|Accuracy||+/- 3% FS of Specific Range|
|User Calibrated Accuracy||+/- 1.5% FS of Specific Range|
|Lead Wire Length||1 ft. ( 12 in.)|
|Battery Type||2 Replaceable AA 1.5 V Batteries|
|Dimension||4.375 in x 2.470 in x 1.12 in|
|Sensing Element||2.0 - 3.6 V (2 x AA 1.5V Batteries or Optional Power Supply)|
|Device Range||250 - 300 ft. non-line-of-sight device range*|
|Battery Life||At 1 hour heartbeat setting, included AA batteries will typically last 3-4 Years. **|
|Max Operating Temperature Using AA Alkaline||-18°C to 55°C (0°F to 130°F)|
|Max Operating Temperature Using AA Lithium||-40°C to 60°C (-40°F to 140°F)|
|Optimal Battery Operating Temperature||+10°C to +50°C (+50°F to +122°F)|
900 MHz Specifications
|Operating Frequency||900 MHz Operating Frequency|
|Certifications||Complies with Part 15 of the FCC Rules. (FCC ID: ZTL-RFSC1)
Complies with Industry Canada standards. (IC: 9794A-RFSC1)